This part of IEC 60404 specifies methods for the measurement of AC magnetic properties of
soft magnetic materials, other than electrical steels and soft ferrites, in the frequency range
20 Hz to 100 kHz. The materials covered by this part of IEC 60404 include those speciality
alloys listed in IEC 60404-8-6, amorphous and nano-crystalline soft magnetic materials,
pressed and sintered and metal injection moulded parts such as are listed in IEC 60404-8-9,
cast parts and magnetically soft composite materials.
The object of this part is to define the general principles and the technical details of the
measurement of the magnetic properties of magnetically soft materials by means of ring
methods. For materials supplied in powder form, a ring test specimen is formed by the
appropriate pressing method for that material.
The measurement of the DC magnetic properties of soft magnetic materials is made in
accordance with the ring method of IEC 60404-4. The determinations of the magnetic
characteristics of magnetically soft components are made in accordance with IEC 62044-3.
NOTE – IEC 62044-3:2000 specifies methods for the measurement of AC magnetic characteristics of magnetically
soft components in the frequency range up to 10 MHz.
Normally, the measurements are made at an ambient temperature of (23 ± 5) °C on test
specimens which have first been magnetized, then demagnetized. Measurements can be
made over other temperature ranges by agreement between parties concerned.